Watch this video with attention and untill its end:
![Shocked :shock:](./images/smilies/icon_eek.gif)
http://www.flightlevel350.com/Aircraft_ ... -8457.html
Well played by the pilots. Incident happened last sunday...
By the way, Simon Lowe is really doing some great videos in MAN.
![Laughing :lol:](./images/smilies/icon_lol.gif)
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Clear enough! ThanksBracebrace wrote:What you see is the result of a surging compressor. The bird ingestion can cause anything from a temporary "hickup" in pressure buildup (could cause a single surge, usually no damage to the engine) to fan blade failure and total engine destruction.
If the compressor stops to provide air at the required pressure for a small period of time (ie because the bird entry distorted the airflow over the compressor blades and some blades stalled), the high pressure burning fuel/air mixture in the combustion chamber has an easier way out up front. In stead of flowing backwards, it flows forward into the compressor. In some surge cases you can see flames exiting the engine at the inlet. This forward flow creates a pressure drop in the combustion chambers and the result is that the burning fuel/air mixture is now propelled backwards again, all the way to the engine exhaust.
However, the engine is still running. It provides thrust, but not the max amount. If the compressor does not recover fast enough, the engine can become unstable (as it did in this vid). The full process will then repeat itself continuously since there is fuel supply and the compressor still rotates: pressure buildup with distorted compressor, forward flow, backward flow (burst of flames at the exhaust), pressure buildup, forward flow, backward flow (burst of flames),...
Sometimes it's a single hickup (one bang, ie in heavy crosswind takeoffs, immediate compressor recovery), sometimes the compressor is unable to recover, becomes unstable. This requires thrust reduction, or sometimes engine shutdown.
Hope this helps
You sure about this? I was taught to say "MAYDAY" when in dire trouble myself, and "PAN" when seeing some other plane in difficulties.FLY4HOURS.BE wrote:Wrong terminology is used, PAN-PAN-PAN should have been used instead of MAYDAY-MAYDAY-MAYDAY as the aircraft was in an emergency, not a distress situation.
Indeed , then you have like they say in dutch 'str. aan de knikker'What I don't understand is that engines are built with standars for bird-strikes. What if both engines have a bird ingestion at the same time?
I don't think you can rely on the plane's maximum glide performances in such cases...
Many thanks for that explanation.Bracebrace wrote:What you see is the result of a surging compressor. The bird ingestion can cause anything from a temporary "hickup" in pressure buildup (could cause a single surge, usually no damage to the engine) to fan blade failure and total engine destruction.
If the compressor stops to provide air at the required pressure for a small period of time (ie because the bird entry distorted the airflow over the compressor blades and some blades stalled), the high pressure burning fuel/air mixture in the combustion chamber has an easier way out up front. In stead of flowing backwards, it flows forward into the compressor. In some surge cases you can see flames exiting the engine at the inlet. This forward flow creates a pressure drop in the combustion chambers and the result is that the burning fuel/air mixture is now propelled backwards again, all the way to the engine exhaust.
However, the engine is still running. It provides thrust, but not the max amount. If the compressor does not recover fast enough, the engine can become unstable (as it did in this vid). The full process will then repeat itself continuously since there is fuel supply and the compressor still rotates: pressure buildup with distorted compressor, forward flow, backward flow (burst of flames at the exhaust), pressure buildup, forward flow, backward flow (burst of flames),...
Sometimes it's a single hickup (one bang, ie in heavy crosswind takeoffs, immediate compressor recovery), sometimes the compressor is unable to recover, becomes unstable. This requires thrust reduction, or sometimes engine shutdown.
Hope this helps
Isn't that how McDonalds makes Chicken McNuggets?smokejumper wrote:In past years, a bird strike test was performed as part of the enginne certification program. A chicken carcass was fired from a pneumatic canon at about 175 miles per hour (280 Km) into the engine. I recall seeing the neatly carved sections exiting the fan assembly.
When the chicken is fired into the turbine, it just shreads, mushes and burns.